I just got that, too. But I'm perplexed on the answer choices provided by the book. The choices are 144, -1, 1, and 5. Obviously, it's either B) -1 or C) 1. What should I do in a case like this? My instincts are going with C) 1...

I just got that, too. But I'm perplexed on the answer choices provided by the book. The choices are 144, -1, 1, and 5. Obviously, it's either B) -1 or C) 1. What should I do in a case like this? My instincts are going with C) 1...

Thanks.

I'm confused about your confusion. If the answer is 1 then it must be answer C. Or am I missing something here?